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SliTaz Live CD: Small But Beautifully Marked

"It will run on VirtualBox too, dispensing with the CD
or the USB stick. If you prefer you can boot from a USB stick too
which will give you a portable persistent home for all your files
and settings. However, it is not necessary to use a USB stick to
have persistent settings. A partition on your hard drive will do
just as well, though this restricts you to settings from one
machine. The stable version will require you to mount the chosen
drive. This is done with the Mountbox GUI. Due to the presence of
HAL, the Cooker version will automount removable
media."